mirror of
https://github.com/golang/go
synced 2024-09-05 07:54:46 +00:00
72 lines
1.3 KiB
Go
72 lines
1.3 KiB
Go
![]() |
// run -gcflags=-G=3
|
||
|
|
||
|
// Copyright 2021 The Go Authors. All rights reserved.
|
||
|
// Use of this source code is governed by a BSD-style
|
||
|
// license that can be found in the LICENSE file.
|
||
|
|
||
|
// Make sure we handle instantiated empty interfaces.
|
||
|
|
||
|
package main
|
||
|
|
||
|
type E[T any] interface {
|
||
|
}
|
||
|
|
||
|
//go:noinline
|
||
|
func f[T any](x E[T]) interface{} {
|
||
|
return x
|
||
|
}
|
||
|
|
||
|
//go:noinline
|
||
|
func g[T any](x interface{}) E[T] {
|
||
|
return x
|
||
|
}
|
||
|
|
||
|
type I[T any] interface {
|
||
|
foo()
|
||
|
}
|
||
|
|
||
|
type myint int
|
||
|
|
||
|
func (x myint) foo() {}
|
||
|
|
||
|
//go:noinline
|
||
|
func h[T any](x I[T]) interface{ foo() } {
|
||
|
return x
|
||
|
}
|
||
|
|
||
|
//go:noinline
|
||
|
func i[T any](x interface{ foo() }) I[T] {
|
||
|
return x
|
||
|
}
|
||
|
|
||
|
func main() {
|
||
|
if f[int](1) != 1 {
|
||
|
println("test 1 failed")
|
||
|
}
|
||
|
if f[int](2) != (interface{})(2) {
|
||
|
println("test 2 failed")
|
||
|
}
|
||
|
if g[int](3) != 3 {
|
||
|
println("test 3 failed")
|
||
|
}
|
||
|
if g[int](4) != (E[int])(4) {
|
||
|
println("test 4 failed")
|
||
|
}
|
||
|
if h[int](myint(5)) != myint(5) {
|
||
|
// TODO: disabled
|
||
|
//println("test 5 failed")
|
||
|
}
|
||
|
if h[int](myint(6)) != interface{ foo() }(myint(6)) {
|
||
|
// TODO: disabled
|
||
|
//println("test 6 failed")
|
||
|
}
|
||
|
if i[int](myint(7)) != myint(7) {
|
||
|
// TODO: This happens to work, but not for the right reasons.
|
||
|
println("test 7 failed")
|
||
|
}
|
||
|
if i[int](myint(8)) != I[int](myint(8)) {
|
||
|
// TODO: disabled
|
||
|
//println("test 8 failed")
|
||
|
}
|
||
|
}
|